sort- separator not required for author name suffix alone

CSL Development
1

I am working for Springer Nature Journals (Standard Nature Research Style). In this style spec,
for Journal article with five authors type reference. Prefix comma not required for author suffix (Jr)
Please see below example:

Price, R. A. Jr, Curry, N. III, McCann, K. E., Fielding, J. L. & Abercrombie,
E. Jr. Analysis of obesity in twins. Hum. Hered. 39 (Suppl.), 121–135
(1989).

Please guide me asap.

2

I’m afraid having an comma between lastname and initials but not before the suffix is not possible in CSL, sorry.